diff --git a/en_US.ISO8859-1/articles/contributors/contrib.additional.sgml b/en_US.ISO8859-1/articles/contributors/contrib.additional.sgml
index d307bf2aba..8b8b24730b 100644
--- a/en_US.ISO8859-1/articles/contributors/contrib.additional.sgml
+++ b/en_US.ISO8859-1/articles/contributors/contrib.additional.sgml
@@ -9811,6 +9811,11 @@
 	<email>yssu@CCCA.NCTU.edu.tw</email></para>
     </listitem>
 
+    <listitem>
+      <para>Yi-Feng Tzeng
+	<email>yftzeng@gmail.com</email></para>
+    </listitem>
+
     <listitem>
       <para>Ying-Chieh Chen
 	<email>yinjieh@csie.nctu.edu.tw</email></para>